Please help identify breeds and sex (in the correct section this time )

[Americano Blue]

I received four lovely chicks from the kindergarten class after they hatched them for a project. I asked, but they didn't know what breeds the chicks actually were or what sex. I usually order them off line or pick them up at a feed store so I've never had to identify breeds or sex before. I have the pics of two of them that I will post below. Thank you a ton!
-Americano Blue
This is Marty McFly

Red Wing (i'll get a more recent picture as soon as I can.)

 

[chicken4prez]

To sex them they need to be older and the breed looks like Wyandottes Beautiful chicks!

 

[Chicken Girl1]

Could you get better photos? #1 could be a Speckled Sussex or a Welsummer. #2 maybe a Silver Campine, I need better photos though.

 

[Americano Blue]

#1

#2
#3
#4

 

[Chicken Girl1]

#1 Does it have "puffy" cheeks?
#2 Looks like a possible barnevelder or GLW what type of comb does it have?
#3 and #4 look like they are the same breed, do they have "puffy" cheeks as well? Could you get photos of them standing by themselves?